Resource allocation

ABSTRACT

A method of communicating control information, performed by a communication device in a mobile telecommunication system in which each of a plurality of communication devices are allocated plural orthogonal frequency-division multiplexing (OFDM) resource allocation, includes receiving, in a control channel, from a base station and over an E-UTRA air interface, control information identifying a resource allocation including frequencies of a shared data channel, and receiving, in the identified resource allocation including frequencies of the shared data channel, from a base station and over an E-UTRA air interface, control information identifying a further resource allocation including frequencies to be used for the transmission of data in the shared data channel.

RELATED APPLICATIONS

The present application is a Continuation Application of U.S. patentapplication Ser. No. 13/067,643, filed on Jun. 16, 2011, which was aContinuation Application of U.S. patent application Ser. No. 12/312,222,now U.S. Pat. No. 8,195,186 B2, having a §371(c) date of Apr. 30, 2009,which was based on and claiming the benefit of priorities ofPCT/JP2007/071673 filed on Nov. 1, 2007, and the United Kingdom PatentApplications No. 06217673.3 of Nov. 1, 2006 and No. 0700365.0 of Jan. 9,2007, the entire contents of which are incorporated herein by reference.

FIELD OF THE INVENTION

The present invention relates to mobile telecommunications networks,particularly but not exclusively to mobile telecommunications networksusing the 3GPP standards and equivalents thereof.

BACKGROUND

Downlink and uplink multiple access schemes for the E-UTRA (EvolvedUniversal Terrestrial Radio Access) air interface are currently beingstudied in 3GPP (which is a standard based collaboration looking at thefuture evolution of third generation mobile telecommunication systems).Under the E-UTRA system, a base station which communicates with a numberof user devices allocates the total amount of time/frequency resource(depending on bandwidth) among as many simultaneous users as possible,in order to enable efficient and fast link adaptation and to attainmaximum multi-user diversity gain. The resource allocated to each userdevice is based on the instantaneous channel conditions between the userdevice and the base station and is informed through a control channelmonitored by the user device. Details of E-UTRA are well-known to thoseskilled in the art and can be found in many publications.

DISCLOSURE OF THE INVENTION

The following analysis is given by the present invention.

Resource allocation information for both uplink from and downlink toscheduled E-UTRA User Equipment (UE) is carried by a shared commoncontrol channel. Since the number of bits available in the controlchannel is limited, efficient methods are needed to transmit therequired information with the lowest number of bits. The Radio AccessNetwork working group RAN1 is proposing the use of a bit map method tosignal the resource allocation to each UE in the E-UTRA downlink.However, the bitmap based approach has a high overhead requiring one bitper physical resource block, that is 50 bits for a 10 MHz bandwidth.Accordingly, a way of signaling the resource allocation that reduces thesignaling load would be desirable.

It is an object of the present invention to provide a method, system, orcomponents thereof, or program therefor to reduce signalling load, suchas high overhead in signalling resource allocation, in a mobiletelecommunication system.

Other objects will become apparent in the entire disclosure includingthe claims and drawings.

Means to Solve the Problems

In one aspect, the present invention provides a method of signallingdownlink resource allocation information in a communication system thatis guaranteed to require a bit overhead less than that of a bitmapmethod. The proposed method can handle the following resourceallocation:

-   -   Discontinuous units of localized allocation: A UE is allocated        multiple discontinuous localized allocations where each        localized allocation is a certain number of contiguous resource        blocks.

In one aspect, the present invention provides a method of signallingresource allocation information in a communication system in which usersare allocated plural resource allocations, wherein at least someresource allocation information is signalled in the data channel ratherthan in the control channel.

In another aspect, the present invention provides a method of signallingcommunications resource allocation information to user devices in acommunications system in which each user device is allocated pluralresource allocations, the method comprising, for each user device,providing resource allocation information regarding one of the resourceallocations allocated to that user device in a control channel andproviding resource allocation information regarding at least one otherresource allocation allocated to that user device in a data channel inthe one resource allocation. This reduces the amount of data that has tobe transmitted in the control channel.

In an exemplary embodiment, the first resource allocation allocated to auser device is selected as the one resource allocation. Resourceallocation information regarding a successive resource allocation isprovided in a data channel in the preceding resource allocation. Asanother possibility, resource allocation information regarding allsucceeding resource allocations is provided in the data channel in theone resource allocation.

The resource allocation information may be provided in the data channelof the one resource allocation as a list of RFI fields or as a bit map.

The resource allocation information may be provided in the data channelof the one resource allocation as a list of RFI fields or as a bit map,dependent upon the number of other resource allocations for whichresource allocation information is provided. The control channel mayhave an indicator that identifies the number of other resourceallocations for which resource allocation information is provided andwhether the resource allocation information is provided as a list of RFIfields or as a bit map.

In an exemplary embodiment, the resource allocation that has the bestchannel quality indicator is selected as the one resource allocation.The resource allocation information regarding each successive furtherresource allocation may be provided in the data channel in the selectedresource allocation.

In an exemplary embodiment, each user device has a dedicated controlchannel. In an exemplary embodiment, each control channel is provided inthe first resource allocation allocated to the corresponding userdevice. This should increase the possibility of correct demodulation ofthe control channel.

In an exemplary embodiment, each control channel is provided in theresource allocation allocated to the corresponding user device that hasthe best channel quality indicator. This should increase the possibilityof correct decoding by a user device. In an exemplary embodiment, eachcontrol channel is provided in the one resource allocation of thecorresponding user device.

In an exemplary embodiment, the control channels are provided in aconsecutive series of resource allocations which may be at the start ofa Transmission Time Interval (TTI). This should reduce control channeldecoding delay. The user devices may be caused to try to have theircontrol channels provided in the resource allocation indicated to havethe best channel quality for that user device. This should reducecontrol channel decoding delay while increasing the possibility ofcorrect decoding by a user device.

In an exemplary embodiment, each discontinuous localized resourceallocation comprises a certain number of contiguous resource blocks.

In an exemplary embodiment, the communications system comprises atelecommunications system such as a cellular telecommunications systemand the user devices may be or comprise cellular telephones.

The present invention also provides a base station configured to carryout a method in accordance with any of the above aspects.

The present invention also provides a method of obtaining resourceallocation information in a mobile telecommunications system in whicheach user device is allocated plural resource allocations, the methodcomprising a user device:

determining from a control channel transmitted by a base stationresource allocation information regarding one of the resourceallocations allocated to that user device; and determining from a datachannel in the one resource allocation resource allocation informationregarding at least one other resource allocation allocated to that userdevice. The present invention also provides a user device configured tocarry out such a method.

These and various other aspects of the invention will become apparent,from the following detailed description of exemplary embodiments whichare given by way of example only and which are described with referenceto the accompanying Drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically illustrates a communication system comprising anumber of user mobile (cellular) telephones which communicate with abase station connected to the telephone network;

FIG. 2 is a block diagram illustrating the main components of the basestation shown in FIG. 1:

FIG. 3 is a block diagram illustrating the main components of one of themobile telephones shown in FIG. 1.

FIG. 4 shows a diagram for explaining a first method in accordance withthe invention for signalling downlink resource allocation, whichrepresents linked discontinuous allocation signalling included in thescheduled resource blocks.

FIG. 5 shows a diagram for explaining a second method in accordance withthe invention for signalling downlink resource allocation, whichrepresents concatenated discontinuous resource allocation signallingincluded in the scheduled resource blocks.

FIG. 6A shows a graph of number of signalling information bits againstoverhead estimation of the signalling information bits to compare firstto third methods in accordance with the invention and a bit map methodfor a 5 MHz bandwidth, in short, overhead estimation of the signallinginformation bits for 5 MHz bandwidth.

FIG. 6B shows a graph of number of signalling information bits againstoverhead estimation of the signalling information bits to compare firstto third methods in accordance with the invention and a bit map methodfor a 20 MHz bandwidth, in short, overhead estimation of the signallinginformation bits for 20 MHz band width and

FIGS. 7 to 10 show diagrams for explaining other methods in accordancewith the invention for signalling downlink resource allocation, amongwhich:

FIG. 7 shows that shared control channel is transmitted in the RB withthe best CQI

allocation information is located in shared data channel RB with thebest CQI

-   -   maximises probability of successful decoding at UE,

FIG. 8 shows that shared control channel is filled from the left

allocation information is located in shared data channel RB with thebest CQI

-   -   minimizes decoding delay of shared control channel since UE will        decode from the left,

FIG. 9 shows that shared control channel is filled from the left, butUEs are ordered to try to transmit each UE's shared control channel inthe RB with the best possible CQI for that user,

allocation information is located in shared data channel RB with thebest CQI

-   -   minimises decoding delay of shared control channel whilst trying        to maximise probability of correct decoding,

FIG. 10 shows that it is possible that the shared control channel andshared data channel will be multiplexed in frequency instead of in time.

DESCRIPTION OF PREFERRED MODES

In the following, proffered aspects and modes for carrying out thepresent invention are disclosed.

(Aspect 1.)

There is provided a method of signalling communications resourceallocation information to user devices in a mobile telecommunicationssystem in which each user device is allocated plural resourceallocations, the method comprising, for each user device, providingresource allocation information regarding one of the resourceallocations allocated to that user device in a control channel andproviding resource allocation information regarding at least one otherresource allocation allocated to that user device in a data channel inthe one resource allocation. (Mode 1)

The method may comprise, for each user device, selecting the firstresource allocation allocated to that user device as the one resourceallocation. (Mode 1-1)

The method may comprise for each user device, selecting the resourceallocation allocated to that user device that has the best channelquality indicator as the one resource allocation. (Mode 1-2)

The method may comprise, for each user device, providing in the datachannel in the one resource allocation resource allocation informationregarding the other resource allocations allocated to the user device.(Mode 1-3)

The method may comprise, for each user device, providing resourceallocation information regarding a successive resource allocation in adata channel in the preceding resource allocation. (Mode 1-4)

The method may comprise, for each user device, selecting the firstresource allocation allocated to that user device as the one resourceallocation, and providing resource allocation information regarding thenext resource allocation in the data channel in the first resourceallocation. (Mode 1-5)

The method may comprise, for each user device, selecting the firstresource allocation allocated to that user device as the one resourceallocation, and providing resource allocation information regarding eachsuccessive further resource allocation in a data channel in the resourceallocation preceding that successive further resource allocation. (Mode1-6)

The method may comprise, for each user device, selecting the firstresource allocation allocated to that user device as the one resourceallocation, and providing resource allocation information regarding eachsuccessive further resource allocation in the data channel in the oneresource allocation. (Mode 1-7)

The method may comprise providing with the resource allocationinformation in the control channel data indicating at least one of thesize of the resource allocation information regarding each successivefurther resource allocation, and the number of resource allocationsallocated to that user device. (Mode 1-8)

The method comprise providing with the resource allocation informationdata indicating whether or not there are additional resourceallocations. (Mode 1-9)

The method may comprise, for each user device, selecting the resourceallocation allocated to that user device that is indicated to have thebest channel quality as the one resource allocation, and providingresource allocation information regarding the other resource allocationsallocated to the user device in the data channel of the one resourceallocation. (Mode 1-10)

In the method according to Mode 1-3, 1-6, 1-7 or 1-10, the resourceallocation information is provided in the data channel of the oneresource allocation as a list of RFI fields or as a bit map, dependentupon the number of other resource allocations for which resourceallocation information is provided. (Mode 1-11)

In the method according to Mode 1-11, the control channel has anindicator that identifies the number of other resource allocations forwhich resource allocation information is provided and whether theresource allocation information is provided as a list of RFI fields oras a bit map. (Mode 1-12)

In the method according to any of the preceding Modes, the methodfurther comprise transmitting the control channel in a resourceallocation having the best channel quality indicator. (Mode 1-13)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device, or there is a single joint coded controlchannel or a plurality of joint coded control channels. (Mode 1-14)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device and the method comprises transmitting eachcontrol channel in the first resource allocation allocated to thecorresponding user device. (Mode 1-15)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device and the method comprises transmitting eachcontrol channel in the resource allocation allocated to thecorresponding user device that has the best channel quality indicator.(Mode 1-16)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device and the method comprises transmitting eachcontrol channel in the one resource allocation of the corresponding userdevice. (Mode 1-17)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device and the method comprises transmitting thecontrol channels in a consecutive series of resource allocations. (Mode1-18)

In the method according to any of Modes 1 to 1-12, there is a pluralityof control channels each containing scheduling information for acorresponding user device and the method comprises transmitting thecontrol channels in a consecutive series of resource allocations. (Mode1-19)

In the method according to Modes 1-16 to 1-18, the method furthercomprises transmitting the control channels in a consecutive series ofresource allocations and causing each user device to try to have itscontrol channel transmitted in the resource allocation indicated to havethe best channel quality for that user device. (Mode 1-20)

In the method according to any of the preceding Modes, the methodfurther comprises additionally providing with the resource allocationinformation in a control channel demodulation information to enable theuser device to demodulate received data. (Mode 1-21)

In the method according to any of Modes 1 to 1-20, the method furthercomprises providing the resource allocation information in a controltransport indication which also comprises data indicating whether or notthere are additional resource allocations for that user device. (Mode1-22)

(Aspect 2.)

There is provided a method of signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system, in which each user device is allocated pluraldiscontinuous localized resource allocations in which data and controlinformation is communicated to that user device on data and controlchannels, the method comprising, for each user device, providing in acontrol channel resource allocation information regarding a firstresource allocation allocated to that user device and providing resourceallocation information regarding each subsequent resource allocationallocated to that user device in the data channel in the precedingresource allocation. (Mode 2)

The method according to Mode 2 may further comprise providing with theresource allocation information data indicating whether or not there areadditional resource allocations for that user device. (Mode 2-1)

(Aspect 3.)

There is provided a method of signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system, in which, in a given transmission time interval(TTI) each user device is allocated plural discontinuous localizedresource allocations in which data and control information iscommunicated to that user device on data and control channels, themethod comprising, for each user device, providing resource allocationinformation regarding a first resource allocation allocated to that userdevice in a control channel and providing resource allocationinformation regarding the or each further resource allocation allocatedto that user device in the data channel in the first resourceallocation. (Mode 3)

In the method according to Mode 3, wherein the resource allocationinformation provided in the control channel includes resource allocationinformation regarding at least one of the size and number of resourceallocations allocated to that user device. (Mode 3-1)

(Aspect 4.)

There is provided a method of signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system, in which, in a given transmission time interval(TTI), each user device is allocated plural discontinuous localizedresource allocations in which data and control information iscommunicated to that user device on data and control channels, themethod comprising, for each user device, providing in a control channelresource allocation information regarding the resource allocationallocated to that user device that has the best channel qualityindicator and providing resource allocation information regarding the oreach further resource allocation allocated to that user device in thedata channel in the resource allocation having the best channel qualityindicator. (Mode 4)

In the method according to Mode 4, for each user device, the controlchannel is provided in the resource allocation having the best channelquality indicator. (Mode 4-1)

In the method according to Mode 4, the respective control channels areprovided in successive resource allocations. (Mode 4-2)

In the method according to Mode 4, the respective control channels areprovided in successive resource allocations and each user device iscaused to try to have its control channel transmitted in the resourceallocation indicated to have the best channel quality for that userdevice. (Mode 4-3)

In the method according to any of Mode 3 to Mode 4, the resourceallocation information is provided in the data channel of the oneresource allocation as a list of RFI fields or as a bit map, dependentupon the number of other resource allocations for which resourceallocation information is provided. (Mode 4-4)

In the method according to Mode 4-4, wherein the control channel has anindicator that identifies the number of other resource allocations forwhich resource allocation information is provided and whether theresource allocation information is provided as a list of RFI fields oras a bit map. (Mode 4-5)

In any of the preceding Modes, each discontinuous localized resourceallocation comprises a certain number of contiguous resource blocks.(Mode 4-6)

In any of the preceding Modes, said communication system uses aplurality of sub-bands, each of which comprises sub-carriers, andwherein the method generates respective resource allocation informationfor sub-carrier allocation in each sub-band. (Mode 4-7)

In any of the preceding Modes, the control and data channels areseparated by time-division multiplexing. (Mode 4-8)

In the method according to any of Mode 1 to Mode 4-7, the control anddata channels are separated by frequency-division multiplexing. (Mode4-9)

In the method according to any of the preceding Modes, the user devicesare cellular telephones. (Mode 4-10)

(Aspect 5.)

There is provided a base station configured to carry out a method inaccordance with any of preceding Modes. (Mode 5)

(Aspect 6.)

There is provided a base station for signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system in which each user device is allocated pluralresource allocations, the base station having a resource allocationmodule operable, for each user device: to provide resource allocationinformation regarding one of the resource allocations allocated to thatuser device in a control channel; and to provide resource allocationinformation regarding at least one other resource allocation allocatedto that user device in a data channel in the one resource allocation.(Mode 6)

(Aspect 7.)

There is provided a base station for signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system in which each user device is allocated pluralresource allocations, the base station comprising: means for providingresource allocation information regarding one of the resourceallocations allocated to a user device in a control channel; and meansfor providing resource allocation information regarding at least oneother resource allocation allocated to that user device in a datachannel in the one resource allocation. (Mode 7)

(Aspect 8.)

There is provided a base station for signalling communications resourceallocation information to user devices in a mobile telecommunicationscommunications system in which each user device is allocated pluralresource allocations, the base station having a resource allocationmodule operable, for each user device: to provide resource allocationinformation regarding one of the resource allocations allocated to thatuser device in a control channel; and to provide resource allocationinformation regarding each other resource allocation allocated to thatuser device as a bit map in a data channel in the one resourceallocation. (Mode 8)

(Aspect 9.)

There is provided a method of obtaining resource allocation informationin a mobile telecommunications system in which each user device isallocated plural resource allocations, the method comprising a userdevice: determining from a control channel transmitted by a base stationresource allocation information regarding one of the resourceallocations allocated to that user device; and determining from a datachannel in the one resource allocation resource allocation informationregarding at least one other resource allocation allocated to that userdevice. (Mode 9)

In the method according to Mode 9, the user device determines theresource allocation information regarding at least one other resourceallocation from the data channel of the first resource allocationallocated to that user device. (Mode 9-1)

In the method according to Mode 9, wherein the user device determinesthe resource allocation information regarding at least one otherresource allocation from the data channel of the resource allocationallocated to that user device that has the best channel qualityindicator. (Mode 9-2)

In the method according to Mode 9, 9-1 or 9-2, the user devicedetermines the resource allocation information regarding the otherresource allocations allocated to the user device from the data channelof the one resource allocation. (Mode 9-3)

In the method according to any of Mode 9 to Mode 9-2, the resourceallocation information is provided in the data channel of the oneresource allocation as a list of RFI fields or as a bit map. (Mode 9-4)

In the method according to Mode 9-4, wherein the control channel has anindicator that identifies the number of other resource allocations forwhich resource allocation information is provided and whether theresource allocation information is provided as a list of RFI fields oras a bit map. (Mode 9-5)

In the method according to any of Mode 1 to Mode 9-3, the user devicedetermines the resource allocation information regarding a successiveresource allocation from information in a data channel in the precedingresource allocation. (Mode 9-6)

(Aspect 10.)

There is provided a user device which is operable to communicate withthe base station of Mode 5, 6, 7 or 8 and which is operable to carry outa method in accordance with any of Mode 9 to Mode 9-6. (Mode 10)

(Aspect 11.)

There is provided a user device for use in a mobile telecommunicationssystem in which each user device is allocated plural resourceallocations, the user device comprising a resource allocation moduleoperable:

to determine from a control channel transmitted by a base stationresource allocation information regarding one of the resourceallocations allocated to that user device; and

to determine from a data channel in the one resource allocation resourceallocation information regarding at least one other resource allocationallocated to that user device. (Mode 11)

(Aspect 12.)

There is provided a user device for use in a mobile telecommunicationssystem in which each user device is allocated plural resourceallocations, the user device comprising:

means for determining from a control channel transmitted by a basestation resource allocation information regarding one of the resourceallocations allocated to that user device; and

means for determining from a data channel in the one resource allocationresource allocation information regarding at least one other resourceallocation allocated to that user device. (Mode 12)

(Aspect 13.)

There is provided a user device for use in a mobile telecommunicationssystem in which each user device is allocated plural resourceallocations, the user device comprising a resource allocation moduleoperable:

to determine from a control channel transmitted by a base stationresource allocation information regarding one of the resourceallocations allocated to that user device; and

to determine from a list of RFI fields or bit map in a data channel inthe one resource allocation resource allocation information regarding atleast one other resource allocation allocated to that user device. (Mode13)

The user device according to any of Modes 10 to 13 in the form of amobile telephone. (Mode 10-1)

(Aspect 14.)

There is provided computer implementable instructions to program aprogrammable device to perform the method of any of preceding modes.(Mode 14)

(Aspect 15.)

There is provided a signal comprising computer implementableinstructions to program a programmable device to perform the method ofany of preceding modes. (Mode 15)

(Aspect 16.)

There is provided a computer-readable medium storing computerimplementable instructions in accordance with Mode 14. (Mode 16)

Overview

FIG. 1 schematically illustrates a mobile (cellular) telecommunicationsystem 1 in which users of user equipments in the form of mobiletelephones (cellphones) UE1, UE2, and UEn can communicate with otherusers (not shown) via a base station 5 and a telephone network 7. Inthis exemplary embodiment, the base station 5 uses an orthogonalfrequency division multiple access (OFDMA) technique in which the datato be transmitted to the mobile telephones UE is modulated onto aplurality of sub-carriers. Different sub-carriers are allocated to eachmobile telephone UE depending on the supported bandwidth of the mobiletelephone UE and the amount of data to be sent to the mobile telephoneUE. In this exemplary embodiment the base station 5 also allocates thesub-carriers used to carry the data to the respective mobile telephonesUE in order to try to maintain a uniform distribution of the mobiletelephones UE operating across the base station's bandwidth. To achievethese goals, the base station 5 dynamically allocates subcarriers foreach mobile telephone UE and signals the resource allocations for eachtime point (TTI) to each of the scheduled mobile telephones UE.

Information has to be signalled to each of the mobile telephones UE toadvise them of the scheduling decision within each sub-band. Theinformation to be signalled includes:

i) resource block allocation information (for both downlinkcommunications and uplink communications);

ii) resource block demodulation information for the downlink;

iii) resource block demodulation information for the uplink;

iv) ACK/NACK for uplink transmissions; and

v) timing control bits.

The present invention provides a method for signalling downlink resourceallocation which should, in most situations, require fewer bits (a lowerbit overhead) than the use of the above-mentioned bit map method.

Base Station

FIG. 2 is a block diagram illustrating the main components of the basestation 5 used in this embodiment. As shown, the base station 5 includesa transceiver circuit 21 which is operable to transmit signals to and toreceive signals from the mobile telephones UE via one or more antennae23 (using the above described sub-carriers) and which is operable totransmit signals to and to receive signals from the telephone network 7via a network interface 25. The operation of the transceiver circuit 21is controlled by a controller 27 in accordance with software stored inmemory 29. The software includes, among other things, an operatingsystem 31 and a resource allocation module 33. The resource allocationmodule 33 is operable to allocate the sub-carriers used by thetransceiver circuit 21 in its communications with the mobile telephonesUE. As shown in FIG. 2, the resource allocation module 33 also includesan encoder module 35 which encodes the allocation into an efficientrepresentation which is then communicated to the respective mobiletelephones UE. The method of resource allocation used may be a method ofdiscontinuous units of localized allocation in which each mobiletelephone UE is allocated multiple discontinuous localized allocationswhere each localized allocation is a certain number of contiguousresource blocks or a distributed chunk allocation method in which amobile telephone UE is allocated multiple discontinuous physicalresource blocks.

Mobile Telephone

FIG. 3 schematically illustrates the main components of each of themobile telephones UE shown in FIG. 1. As shown, each mobile telephone UEincludes a transceiver circuit 71 which is operable to transmit signalsto and to receive signals from the base station 5 via one or moreantennae 73. As shown, the mobile telephone UE also includes acontroller 75 which controls the operation of the mobile telephone UEand which is connected to the transceiver circuit 71 and to aloudspeaker 77, a microphone 79, a display 81, and a keypad 83. Thecontroller 75 operates in accordance with software instructions storedwithin memory 85. As shown, these software instructions include, amongother things, an operating system 87 and a communications module(resource allocation module) 89. In this embodiment, the communicationsmodule 89 includes a decoder module 91 which is operable to decode theresource allocation data signalled from the base station 5 to determinethat mobile telephone's sub-carrier allocation for the current timepoint.

First Example

A first method in accordance with the invention for signalling downlinkresource allocation will now be explained with the aid of FIG. 4 whichshows a diagram representing part of a TTI 50 of frequency divisionmultiplexed resource blocks RB and comprising a fixed size sharedcontrol channel set 51 monitored by the mobile telephones and a shareddata channel 52.

FIG. 4 shows downlink resource allocation for mobile telephones UE1 toUEn. This figure shows the case for individually coded control channelsand illustrates an example where a mobile telephone UE1 is scheduled toreceive data on three discontinuous localised resource block allocationsRB1, RB3 and RB5. We are not proposing here any multiplexing scheme forthe downlink L1/L2 control channels.

As shown, the resource allocation module 33 has in this exampleallocated resource blocks RB1, RB3 and RB5 of the shared data channel tomobile telephone UE1, resource block RB2 to mobile telephone UE2,resource block RB4 to mobile telephone UE3 and resource block RBn tomobile telephone UEn. In this example, the resource allocation module 33causes the control channels L1 to L4 and Ln for the mobile telephones UE1 to UE4 and UEn to be transmitted in the first resource blocksallocated to those mobile telephones (that is resource blocks RB1, RB2,RB3, RB4 and RBn in the example shown). It will of course be appreciatedthat this is merely an example and that other resource allocations arepossible.

Each mobile telephone UE monitors the set of fixed size shared controlchannels 51 which indicate the resource allocation for the firstlocalised set only. Information about subsequent localised allocationswithin the same TTI is provided within the resource blocks of thecurrent allocation.

Thus, in this exemplary embodiment, the resource allocation module 33 ofthe base station 5 is configured to control the location of informationindicating the downlink resource allocation for a TTI so that eachcontrol channel L1 to Ln contains resource allocation information onlyfor the first resource block allocated to the corresponding mobiletelephone and so that resource allocation information identifying thenext (second) resource block allocated to that mobile telephone isprovided within the first resource block of the current allocation andinformation for any third resource block is provided within the secondresource block, and so on. This reduces the amount of data that has tobe transmitted in the control channel.

Thus, in the example shown in FIG. 4, information I1 identifying thefirst resource block RB1 for the mobile telephone UE1 is provided in theshared control channel 51 but information I2 indicating the seconddownlink resource allocation or resource block for the mobile telephoneUE1 is provided in the first resource block RB1 and information I3indicating the third downlink resource allocation is provided in theresource block RB3. Although only three resource blocks RB1, RB3 and RB5are shown for the mobile telephone UE1, it will be appreciated that thesame procedure will be used for subsequent resource blocks so that, fora given TTI and mobile telephone, resource allocation information forthe first resource block is provided in the shared control channel andresource allocation information for each succeeding resource block isprovided in the immediately preceding resource block.

The downlink resource allocation information can be signalled by usingan optimised tree-based method for signalling contiguous allocationsdescribed in R1-062773—NEC Group, NTT DoCoMo—“Uplink Resource Allocationfor EUTRA” (which is available athttp://www.3gpp.org/ftp/tsg_ran/WG1_RL1/TSGR1_(—)46bis/Docs/) and in UKPatent Application No. 0605581.8 (Our ref P28952 GB), the whole contentsof which are hereby incorporated by reference. As per the currentworking assumption in 3GPP, there are 50 resource blocks within a 10 MHzbandwidth leading to an 11 bit resource allocation within the sharedcontrol channel using the tree-based signalling method proposed in theabove-mentioned paper and in UK Patent Application No. 0605581.8.

In addition to the resource allocation information, the shared controlchannel 51 also needs to contain an indicator or “Follow Up” bitindicating the presence or absence of subsequent additionaldiscontinuous resources within the scheduled data block. Thus, a 2 bitlength string (assuming 10 MHz UE capability) following the UE ID withinthe shared control channel L1, L2, L3 or L4 is sufficient to containinformation about the first allocated resource block and an indicationof the presence of additional resources within the same TTI.

The 11 bit resource allocation information together with the “Follow Up”bit (total of 12 bits) can be called a “Control RFI” within the sharedcontrol channel L1, L2, L3 or L4, where RFI is the Resource FormatIndicator. The shared control channel L1, L2, L3 or L4 also carries aTransport Format Indicator TFI for data to enable the mobile telephoneUE to demodulate its data accurately.

In this example, when there is additional or linked resource allocation,the resource allocation module 33 sets a “Follow Up” bit of 1 in thecontrol RFI of the shared control channel to indicate to the mobiletelephone UE that there is additional or linked resource allocation (itwill be appreciated that the opposite convention could be used so that azero indicates the presence of at least one additional resource block).Thus, in this example, if the “Follow Up” bit in the control RFI of theshared control channel is 1, it indicates linked resource allocation tothe mobile telephone UE so that the mobile telephone is thus alerted toexpect an additional control RFI in the first localised allocationblock, 0 indicates otherwise.

In the same manner, the resource allocation module 33 will set the“Follow Up” bit in the control RFI in the first localised allocationresource block to 1, if there is a further linked resource allocation(data and control RFI (if present)). For example, in the case shown inFIG. 4, the resource allocation module 33 will set the “Follow Up” bitin the control RFI I2 in resource block RB1 to indicate to the mobiletelephone UE1 that there is a linked resource allocation RB3 and willset the “Follow Up” bit in the control RFI I3 in resource block RB3 toindicate to the mobile telephone UE1 that there is a linked resourceallocation in the form of resource block RB5, and so on. This method ofindication proceeds, until the last localised allocation within the TTIis reached and that resource block will of course have a “Follow Up” bitof 0, indicating that there are no further localised allocations forthat mobile telephone in the current TTI.

The proposed mechanism has a number of advantages over the bitmapmethod—

-   -   Since the resource blocks allocated to the mobile telephone UE        are based on CQI (Channel Quality Indicator) reports and are        among the ones with the best reception quality at the mobile        telephone UE, placing the control information within the same        resource blocks will increase the possibility of correct        demodulation of the control information    -   Assuming individual coded control channels, a mobile telephone        UE needs to read a single control channel to decipher its        resource allocation across the whole bandwidth as opposed to        multiple channels where each can provide resource allocation        information across a particular part of the bandwidth. The        individual control channels are all also of the same size since        the size is determined by the number of bits in the resource        allocation pattern within the control channel. This means that        there is no need for the mobile telephone UE to detect the        control channel boundaries using any bit pattern or blind        detection methods. Buffering requirements for the mobile        telephone UE is also reduced since the mobile telephone UE can        stop reading additional control channels as soon as it detects        its own ID in one as opposed to the case where multiple control        channels provide resource allocation information to the mobile        telephone UE.    -   Assuming 10 MHz UE capability and control signalling indicating        resource allocation for the entire 10 MHz band, up to 4        discontinuous localised resource allocations can be supported        with a total resource requirement less than a single 50 bit        bitmap (assuming 12 bits in each control RFI). Alternatively, if        each allocation is done in units of smaller bandwidths, the        total bit overhead can be further reduced (e.g. resource        allocation over 2.5 MHz requires 7 bits as discussed in the        afore mentioned paper R1-062773—NEC Group, NTT DoCoMo—“Uplink        Resource Allocation for EUTRA” and in UK Patent Application No.        0605581.8) implying that 28 bits can be used to indicate        resource allocation across the entire 10 MHz bandwidth).    -   Since the OFDM (Orthogonal Frequency Division Multiplexing)        symbols reserved for carrying the control channel (possibly        first and second OFDM symbol) do not include all the resource        allocation information, the overhead per mobile telephone UE        within these resources is reduced leading to more mobile        telephone UEs being multiplexed within the control resources.

The data and control RFI (if present) in the first localised allocationcan be encoded together in order to achieve a larger coding gain.However, it is better to encode the control RFI separately for areliable detection at the cell edge as there is no HARQ (HybridAutomatic Repeat reQuest) retransmission for the control part.

Size Estimate of RFI

This section provides an estimate of the size of the individual RFIs inorder to quantify their resource occupancy within each discontinuouslocalised resource blocks.

As set out above, the control RFI is 12 bits (11 bit resource allocationand 1 bit “Follow Up”) which when protected with an 8 bit CRC andencoded using a 1/3 code occupies 30 subcarriers assuming QPSKmodulation. Higher order modulations can be used to carry the controlinformation since they are present on resource blocks on which themobile telephone UE has good channel conditions. This will furtherreduce the subcarriers used to transmit the control information. Theexact mapping of the subcarriers carrying the control information ontothe time-frequency plane is not specified here and is for furtherdiscussion.

Other Variants

In other variants, all of the subsequent control RFIs are combined andincluded within the first discontinuous localised resource allocation orthe one with best CQI, i.e. the best channel condition. The potentialadvantage of this method is the larger coding gain due to theconcatenation of all the control RFIs of the discontinuous localisedallocations. However, since the number of control RFIs in a TTI isdynamic and will depend on the number of discontinuous localisedallocations assigned to the user by the scheduler, an additional fieldwill be needed within the main shared control channel to indicate thesize of the concatenated control RFIs. For example, 2-bit and 3-bit inthe main shared control channel may be enough to indicate up to 3 and 7discontinuous localised allocations for 5 MHz and 20 MHz bandwidths,respectively. In that case, “Follow Up” bit is not needed. This two bitfield could alternatively be placed in the data channel along with thecontrol RFIs.

Second Example

A second method in accordance with the invention for signalling downlinkresource allocation will now be explained with the aid of FIG. 5 whichlike FIG. 4 shows a diagram representing part of a TTI 50 againcomprising resource blocks RB providing a shared data channel 52 and acorresponding set 51 of fixed size shared control channels L1, L2, L3and L4 monitored by the mobile telephones UE1 to UEn. In the methodrepresented by FIG. 5, the resource allocation module 33 of the basestation 5 is configured to cause (for each mobile telephone), all of thecontrol RFIs subsequent to those for the first resource block (block RB1for UE1 in FIG. 5) of the TTI to be combined and included within thefirst localised resource allocation, that is the first resource block.Thus, in the example illustrated in FIG. 5, for the mobile telephoneUE1, the first resource block RB1 contains at I4 all of the control RFIsfor the TTI subsequent to those for the first resource block. Thismethod has the potential for larger coding gain due to the concatenationof all the RFIs of the discontinuous localised allocations. However,since the number of RFIs in a TTI is dynamic and will depend on thenumber of discontinuous localised allocations allocated to the user bythe resource allocation module 33, an additional field is needed withinthe information I1′ in the shared control channel 51 for the firstresource allocation to indicate the number of discontinuous localisedallocations and/or the size of the concatenated data and control RFIs.For example, two bits in the main shared control channel may be enoughto indicate up to four discontinuous localised allocations. In thiscase, the “Follow Up” bit of FIG. 4 is not needed.

Third Example

In this example, dynamic switching between the list of RFI fields as inthe second example and the bit mapping method is included in theScheduled Resource Blocks.

Where, as in the case of the second example, resource allocationinformation for all subsequent resource allocations is in the datachannel of one resource allocation, when the number of discontinuouslocalised allocations increases, the number of signalling informationbits also increases and can eventually exceed the number required forthe bit map method. However, when this limit is reached we can place abit map in the first allocated data region instead of the list of RFIfields. This can be indicated by reserving one value of the ‘number ofRFIs’ field in the shared control channel. An example is shown in Table1 for the case of 20 MHz.

TABLE 1 Concatenation Indicator field included in the shared controlchannel. 000 No additional control RFI is present 001 1 additionalcontrol RFI is present 010 2 additional control RFIs are present . . .110 6 additional control RFIs are present 111 More than 6 additionalcontrol RFIs are present, and are indicated using a bit map in the firstallocation.Signalling Overhead Comparison to Bit Map Method

This section provides an overhead estimate of each of the first to thirdexamples compared to the bit map method.

Table 2 shows the number of bits required on the shared control channeland in the data part for each of the first to third examples (Alt 1 toAlt 3). In Table 2, y is the number of discontinuous allocations to besignalled, x is the number of bits needed to signal one resourceallocation using the ‘tree-based’ method and n is the number of bitsneeded using the bit map method (see Table 3). In the case of the thirdexample, one of the two options is selected each TTI according to thevalue of y, in order to minimise the number of bits required.

TABLE 2 Signalling overhead estimation without Discontinuous allocationsfor all bandwidths Third Example When bit First Second When RFI map isExample Example is signalled signalled Shared Control Channel RBindicator x x x x ‘Follow-up’ 1 bit ‘Concat- 3 3 3 enation Indicator’Data Channel RB indicator x(y − 1) x(y − 1) x(y − 1) n ‘Follow-up (y− 1) bit’ CRC 8(y − 1) 8 if y > 1 8 if y > 1 8 0 otherwise 0 otherwiseTotal (x + 9)y − 8 x + 3, if y = 1 x + 3, if y = 1 x + n + 11 x · y +11, x · y + 11, y > 1 y > 1

TABLE 3 Number of bits needed to signal one allocation Bandwidth (MHz)1.25 2.5 5 10 15 20 Bit map Method 6 12 25 50 75 100 (n bits)Tree-Method 5 7 9 11 12 13 (x bits)

FIGS. 6A and 6B compare the first to third examples with the bit mapmethod for 5 MHz and 20 MHz respectively, using the equations in Table2. In FIGS. 6A and 6B, the lines 100, 101, 102 and 103 represent thefirst example (Alt 1), the second example (Alt 2), the third example(Alt 3) and the bit map method, respectively. It can be seen from the 20MHz case shown in FIG. 6B that the second example (alt2) uses fewer bitsthan the bit map method if the number of discontinuous allocations isbelow eight. However, in the 5 MHz case (FIG. 6A), the second example(alt) uses more bits than the bit map method with only two discontinuousallocations.

In the case of the third example (alt3), the bit map mode becomes moreefficient when the number of discontinuous allocations reaches 3, 5, 7and 8 for 5 MHz, 10 MHz, 15 MHz and 20 MHz, respectively.

It should be noted that user equipment UE will not always be assigned alarge number of discontinuous localised allocations. In most of thecases, a small number of discontinuous localised allocations might beassigned. In that case, a lot of signalling bits will be saved comparedto when full bit map method is always used.

Fourth Example

Another method in accordance with the invention for signalling downlinkresource allocation will now be explained with the aid of FIG. 7 whichagain shows a diagram representing part of a TTI 50 comprising resourceblocks RB and a corresponding set of fixed size shared control channels51 monitored by the mobile telephones UE1 to UEn. In this example,resource blocks RB1, RB4 and RB7 are shown allocated to mobile telephoneUE2, resource blocks RB2 and RB5 are shown allocated to mobile telephoneUE3, resource block RB3 is shown allocated to mobile telephone UE1 andresource block RB6 is shown allocated to mobile telephone UE4.

In the example shown in FIG. 7, the resource allocation module 33 isconfigured to cause the shared control channel L1, L2, L3 or L4 for amobile telephone not to be allocated to the first resource block forthat mobile telephone but rather to be transmitted in the resource blockhaving the best CQI and also to cause the downlink resource allocationinformation for a mobile telephone to be located in the resource blockRB that has the best CQI.

Thus, in the example shown in FIG. 7, the resource allocation module 33transmits the shared control channel L2 in the resource block RB4because that resource block has a CQI of 10 whereas the other resourceblocks RB1 and RB7 associated with that mobile telephone have CQIs of 8and 6, respectively. Similarly, the resource allocation module 33transmits the shared control channel L3 in the resource block RB5because the resource block RB5 has a CQI of 8 whereas the other resourceblock RB2 associated with that mobile telephone has a CQI 7. The sharedcontrol channels L1 and L4 for the mobile telephones UE1 and UE4 aretransmitted in the only allocated resource block RB3 (CQI 6) and RB6(CQI 11) allocated to those mobile telephones, respectively.

In the example illustrated by FIG. 7, the data TFIs and the control RFIfor the resource block having the highest CQI are contained within thecorresponding shared control channel L1, L2 L3 or L4 and the controlRFIs for any other resource blocks in the TTI allocated to that mobiletelephone are contained in the highest CQI resource block. Thus, for themobile telephone UE2, the control channel L2 contains information I5comprising the data TFIs and the control RFI for the resource block RB4and the resource block RB4 contains information I6 comprising thecontrol RFIs for the other resource blocks (RB1 and RB7) allocated tothe mobile telephone UE2 in the current TTI. Similarly, for the mobiletelephone UE3, the control channel L3 contains information I7 comprisingthe data TFIs and the control RFI for the resource block RB5 and theresource block RB5 contains information I8 comprising the control RFIsfor the other resource block RB2 allocated to the mobile telephone UE3in the current TTI. The location of the control channel in the resourceblock having the best CQI and the location of the control RFIs for anyother resource blocks allocated to that mobile telephone in the resourceblock having the best CQI maximises the probability of successfuldecoding by the decoder module 91 of the mobile telephone.

Fifth Example

FIG. 8 shows a diagram for explaining another method in accordance withthe invention for signalling downlink resource allocation which differsfrom the method shown in FIG. 7 in that the resource allocation module33 is in this example configured to fill the shared control channels 51frequency slots in the order in which the mobile telephone UE processesthe control channels to determine the control channel in which it isscheduled. The order in which a mobile telephone UE processes thecontrol channels corresponds to leftmost to rightmost in FIG. 8, so thatthe control channels L1, L2, L3 and L4 are associated with the firstfour leftmost resource blocks in the example shown. In this case, theinformation comprising the control RFIs and data TFIs in the controlchannel L1, L2, L3 or L4 points the mobile telephone to the resourceblock allocated to that mobile telephone that has the best CQI, in theexample shown this is the resource block RB4 for the mobile telephoneUE2 and the resource block RB5 for the mobile telephone UE3. As in FIG.7, the resource allocation module 33 is configured to cause the best CQIresource block for each mobile telephone to contain the informationcomprising the control RFIs for the other resource blocks allocated tothat mobile telephone, so in the example shown for the mobile telephonesUE2 and UE3, resource blocks RB4 and RB5 contain information I9 and I10comprising the control RFIs. It will of course be appreciated that theorder shown in FIG. 8 is only an example and that other processingorders are possible.

The filling of the shared control channels 51 in the order which amobile telephone UE processes the control channels, that is from theleftmost to the rightmost slot in FIG. 8, minimises decoding delay ofthe shared control channels compared to the scenario shown in FIG. 7.

Sixth Example

FIG. 9 shows a diagram for explaining another method in accordance withthe invention for signalling downlink resource allocation. As in FIG. 8,the resource allocation module 33 causes the shared control channel 51to be filled from the left, but in this example, the mobile telephonesUE are ordered by the resource allocation module 33 of the base stationto try to transmit each UE's shared control channel L1, L2, L3 and L4 inthe resource block RB with the best possible CQI for that user so thatthe order in which the shared control channel 51 is filled depends uponthe CQI for the user, in the example shown this results in the fillingorder being L2, L3, L1 and then L4. As in FIG. 8, the informationcomprising the control RFIs and data TFIs in the control channel L1, L2,L3 or L4 points the corresponding mobile telephone to the resource blockallocated to that mobile telephone that has the best CQI, in the exampleshown this is the resource block RB4 for the mobile telephone UE2 andthe resource block RB5 for the mobile telephone UE3. As in FIG. 8, theresource allocation module 33 is configured to cause the best CQIresource block for each mobile telephone to contain the informationcomprising the control RFIs for the other resource blocks allocated tothat mobile telephone, so in the example shown for the mobile telephonesUE2 and UE3, resource blocks RB4 and RB5 again contain information I9and I10 comprising the control RFIs.

The method illustrated by FIG. 9, minimizes decoding delay of sharedcontrol channel whilst trying to maximize the probability of correctdecoding.

Seventh Example

The above described methods may be applied where frequency rather thantime division multiplexing is used to separate the Shared ControlChannel and Shared Data Channel. FIG. 10 shows a diagram for explaininga method, similar to FIG. 9, of signalling downlink resource allocationwhere the shared control channel 61 and shared data channel 62 of a TTIare separated by frequency rather than time division multiplexing, as inthe earlier examples. FIG. 10 again shows downlink resource allocationfor four mobile telephones UE1 to UE4. The resource allocation module 33has in this example allocated resource blocks RB10, RB13 and RB16 of theshared data channel to mobile telephone UE1, resource blocks RB11 andRB14 to mobile telephone UE2, resource block RB12 to mobile telephoneUE3, and resource block RB15 to mobile telephone UE4. In this example,the resource allocation module 33 again causes the corresponding controlchannel L1 to L4 to contain the information comprising the data TFIs andthe control RFI for the best CQI resource block (resource blocks RB13and RB14 for mobile telephones UE1 and UE2, respectively, in FIG. 10)for the corresponding mobile telephone and the best CQI resource blockcontains information (I12 and I13 in resource blocks RB13 and RB 14,respectively) comprising the control RFIs for the other resource blocksallocated to that mobile telephone.

Conclusions

In embodiments described above, resource allocation information issignalled to user devices in a communications system in which each userdevice is allocated plural resource allocations by, for each userdevice, providing information regarding a selected resource allocationallocated to that user device in a control channel and providinginformation regarding at least one other resource allocation allocatedto that user device in a data channel in the selected resourceallocation. In one example, the selected resource allocation is thefirst resource allocation allocated to that user device and informationregarding each successive further resource allocation is provided in adata channel in the resource allocation preceding that successivefurther resource allocation. In another example, the selected resourceallocation is the first resource allocation allocated to that userdevice and information regarding each successive further resourceallocation is provided in a data channel in the first resourceallocation. In another example, the selected resource allocation is theresource allocation that is indicated to have the best channel quality.

It is shown that alternative 3 achieves significant reduction in controlsignalling overhead compared to when full bitmap signalling is alwaysused.

Methods have been described above for indicating discontinuous localisedresource allocations applicable to the EUTRA downlink. Example 3 (Alt 3)in particular achieves significant reduction in control signallingoverhead compared to when full bitmap signalling is always used. Hence,we propose to adopt such method for LTE (Long Term Evolution) DL (DownLink) resource assignment.

MODIFICATIONS AND ALTERNATIVES

A number of detailed examples have been described above. As thoseskilled in the art will appreciate, a number of modifications andalternatives can be made to the above examples whilst still benefitingfrom the inventions embodied therein. By way of illustration only anumber of these alternatives and modifications will now be described.

It will of course be appreciated that the particular resourceallocations shown in FIGS. 4 to 10 are simply examples and that otherresource allocations are possible.

Where appropriate and compatible, features described with respect to anyof the above examples described above may be used in the other examples.

In the above-described examples, there is a plurality of controlchannels each containing scheduling information for a corresponding userdevice. However, the present invention may be applied where there is asingle joint coded control channel or where there is a plurality ofjoint coded control channels and the mobile telephones are organized ingroups with each group being associated with a corresponding one ofplurality of joint coded control channels.

In the above examples, the user equipments are mobile telephones. Theuser equipments could however be any user equipment capable ofcommunicating via a mobile telecommunications system.

In the above examples, a mobile telephone based telecommunication systemwas described in which the above described signalling techniques wereemployed.

As those skilled in the art will appreciate, the invention is notlimited to this particular size of bandwidth or to the size of thesub-bands mentioned above. In the above examples, a number of softwaremodules were described. As those skilled will appreciate, the softwaremodules may be provided in compiled or un-compiled form and may besupplied to the base station or to the mobile telephone as a signal overa computer network, or on a recording medium. Further, the functionalityperformed by part or all of this software may be performed using one ormore dedicated hardware circuits. However, the use of software modulesis preferred as it facilitates the updating of base station 5 and themobile telephones UE in order to update their functionalities.

Particularly, the present invention includes the following modes.

(1) A method of signalling communications resource allocationinformation substantially as described herein with reference to or asshown in the accompanying drawings.

(2) A method of receiving communications resource allocation informationsubstantially as described herein with reference to or as shown in theaccompanying drawings.

(3) A base station for signalling communications resource allocationinformation substantially as described herein with reference to or asshown in the accompanying drawings.

(4) A user device for receiving communications resource allocationinformation substantially as described herein with reference to or asshown in the accompanying drawings.

The invention claimed is:
 1. A method of communicating controlinformation, the method performed by a communication device in a mobiletelecommunication system, in which mobile telecommunication systemorthogonal frequency-division multiplexing (OFDM) resource allocation isused, the method comprising: receiving, in a control channel, from abase station and over an Evolved Universal Terrestrial Radio Access(E-UTRA) air interface, control information identifying a resourceallocation comprising frequencies of a shared data channel; andreceiving, in the identified resource allocation comprising frequenciesof the shared data channel, from the base station and over an E-UTRA airinterface, control information identifying a further resource allocationcomprising frequencies to be used for the transmission of data in theshared data channel.
 2. A communication device of a mobiletelecommunication system in which orthogonal frequency-divisionmultiplexing (OFDM) resource allocation is used, the communicationdevice being adapted to: receive, in a control channel, from a basestation and over an Evolved Universal Terrestrial Radio Access (E-UTRA)air interface, control information identifying a resource allocationcomprising frequencies of a shared data channel; and receive, in theidentified resource allocation comprising frequencies used of the shareddata channel, from the base station and over an E-UTRA air interface,control information identifying a further frequency resource allocation.3. A method of communicating control information, the method performedby a base station in a mobile telecommunication system, in which mobiletelecommunication system orthogonal frequency-division multiplexing(OFDM) resource allocation is used, the method comprising: transmitting,by the base station, in a control channel, to a communication device andover an Evolved Universal Terrestrial Radio Access (E-UTRA) airinterface, control information identifying a resource allocationcomprising frequencies of a shared data channel; and transmitting, bythe base station, in the identified resource allocation comprisingfrequencies of the shared data channel, to a communication device andover an E-UTRA air interface, control information identifying a furtherfrequency resource allocation.
 4. A base station, of a mobiletelecommunication system in which orthogonal frequency-divisionmultiplexing (OFDM) resource allocation is used, the base station beingadapted to: transmit, in a control channel, to a communication deviceand over an Evolved Universal Terrestrial Radio Access (E-UTRA) airinterface, control information identifying a frequency resourceallocation in a shared data channel; and transmit, in the identifiedfrequency resource allocation in the shared data channel, to thecommunication device and over an E-UTRA air interface, controlinformation identifying a further frequency resource allocation.
 5. Anon-transitory computer-readable storage medium storing computerimplementable instructions to program a programmable device to performthe method of claim
 1. 6. A non-transitory computer-readable storagemedium storing computer implementable instructions to program aprogrammable device to perform the method of claim
 3. 7. A mobiletelecommunication system in which orthogonal frequency-divisionmultiplexing (OFDM) resource allocation is used, the mobiletelecommunication system comprising: a base station; and a communicationdevice, wherein the base station is adapted to: transmit, in a controlchannel, to the communication device over an Evolved UniversalTerrestrial Radio Access (E-UTRA) air interface, control informationidentifying a resource allocation comprising frequencies of a shareddata channel; and transmit, in the identified resource allocationcomprising frequencies of the shared data channel, to the communicationdevice over an E-UTRA air interface, control information identifying afurther resource allocation comprising frequencies to be used for thetransmission of data in the shared data channel.
 8. The method of claim1, wherein the control channel includes a best channel qualityindicator.
 9. The method of claim 8, wherein said receiving in thecontrol channel comprises receiving, at the communication device, thecontrol information identifying the resource allocation comprising thefrequencies of the shared data channel.
 10. The method of claim 1,wherein said receiving in the control channel comprises receiving, atthe communication device, the control information identifying theresource allocation comprising the frequencies of the shared datachannel.
 11. The method of claim 10, wherein said receiving in theidentified resource allocation comprises receiving, at the communicationdevice, the control information identifying the further resourceallocation comprising the frequencies to be used for the transmission ofdata in the shared data channel.
 12. The method of claim 1, wherein theidentified resource allocation is utilized for transmitting the furtherresource allocation.
 13. The method of claim 1, wherein the identifiedresource allocation transmitted in the control channel is received andinterpreted, and, after resources of the shared data channel areinterpreted, the identified resource allocation is utilized fortransmitting the further resource allocation.
 14. The method of claim 1,wherein a part of the control information identifying the resourceallocation is a same type as a part of the control informationidentifying the further resource allocation.